WO2015179650A1 - Appareil destiné à l'application d'un adhésif fusible à un substrat - Google Patents

Appareil destiné à l'application d'un adhésif fusible à un substrat Download PDF

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Publication number
WO2015179650A1
WO2015179650A1 PCT/US2015/031988 US2015031988W WO2015179650A1 WO 2015179650 A1 WO2015179650 A1 WO 2015179650A1 US 2015031988 W US2015031988 W US 2015031988W WO 2015179650 A1 WO2015179650 A1 WO 2015179650A1
Authority
WO
WIPO (PCT)
Prior art keywords
template
adhesive
cavity
fluid
transporting
Prior art date
Application number
PCT/US2015/031988
Other languages
English (en)
Inventor
Andreas Pahl
Original Assignee
Illinois Tool Works Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102014007425.0A external-priority patent/DE102014007425B4/de
Application filed by Illinois Tool Works Inc. filed Critical Illinois Tool Works Inc.
Publication of WO2015179650A1 publication Critical patent/WO2015179650A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/025—Nozzles having elongated outlets, e.g. slots, for the material to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • B05B12/04—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for sequential operation or multiple outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/58—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter preventing deposits, drying-out or blockage by recirculating the fluid to be sprayed from upstream of the discharge opening back to the supplying means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0884—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point the outlet orifices for jets constituted by a liquid or a mixture containing a liquid being aligned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
    • B05C5/0229—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet the valve being a gate valve or a sliding valve
    • B05C5/0233—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet the valve being a gate valve or a sliding valve rotating valve, e.g. rotating perforated cylinder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet

Definitions

  • Apparatuses for applying a hot-melt adhesive, a so-called hot melt, to a substrate, in particular to a so-called disposable hygiene product, such as diapers or sanitary napkins, are already basically common knowledge from the prior art.
  • the invention achieves this object by way of an apparatus comprising a template, having at least one cavity for the hot-melt adhesive, and also comprising an adhesive -transfer infeed, which is assigned to the template and through which the adhesive can be introduced into the cavity, wherein the apparatus further comprises a transporting-fluid-supply opening, assigned to the template, and a device for displacing, in particular pivoting, the template between a first position, in which the cavity is assigned to the adhesive-transfer infeed, and a second position, in which the cavity is assigned to the transporting-fluid-supply opening, and therefore the adhesive, in the second position, can be discharged from the cavity by a transporting fluid flowing through the transporting-fluid-supply opening.
  • the hot-melt adhesive also abbreviated to "adhesive” hereinbelow
  • adhesive pressure for example on account of volumetric pumps
  • discharging the hot-melt adhesive is thus essentially that of separating in the first instance a small sub-quantity of adhesive from the adhesive infeed, subsequently displacing the sub-quantity and then discharging it from the apparatus (at a separate location) by a transporting fluid, in particular compressed air, and applying it to the substrate.
  • the adhesive which is to be discharged is separated off here by being separated from the prevailing pressure of the adhesive flowing on behind, and the separate transporting fluid ensures optimized application to the substrate.
  • the adhesive is transferred to the cavity of the template, or supplied to the same, via an adhesive -transfer infeed. It is possible here for the adhesive -transfer infeed to be connected, for example via channels in the apparatus, to an adhesive connection which, for its part, is connected to an adhesive store which is separate or integrated in the apparatus.
  • the hot-melt adhesive is preferably melted and directed onward, via the channels, to the adhesive -transfer infeed. These channels are usually heated. It is also possible for the adhesive -transfer infeed to be heated.
  • the at any rate partially liquefied adhesive is displaced, by a drive acting on the template, to a transporting- fluid-supply opening.
  • the chamber has its contents preferably blown out by the transporting fluid, in particular compressed air.
  • a so-called air knife which provides a very sharp formation of air for discharging the adhesive from the cavity. This generates a blade of air which guides the adhesive out of the cavity (preferably through an exit opening of the apparatus) directly to the substrate.
  • the apparatus according to the invention makes it possible, in a novel manner, for adhesive to be applied to a substrate in a very sharply defined and optimized manner. It is preferably ensured here that the cavity must/may accommodate only a relatively small quantity of the adhesive, preferably only a few drops of the adhesive.
  • the cavity therefore has very small/narrow dimensions, only a cavity of relatively small/narrow dimensions also being capable of retaining during displacement (by the displacement device) the adhesive introduced into it. If the cavity were to have very generous dimensions, for example dimensioning of one centimeter times one centimeter, then, possibly on account of surface tensions being too low, the adhesive, when directed into a cavity of such large dimensions, rather than remaining in the cavity, would leave the cavity again even prior to the same being displaced.
  • the cavity at least along one of its two surface dimensions, has a width of less than two millimeters, preferably of less than one millimeter.
  • the cavity here, as seen in plan view, is in particular in the form of dots or in linear form.
  • cavity within the context of the present patent application, is understood as being not exclusively a fully closed-off and separated, hollow-like space in a material. Rather, cavity describes, in particular, a through- passage in the template. To this extent, the cavity is enclosed, for example, by lateral walls, but is open towards the top and bottom.
  • the template it is preferable for the template to have not just merely one cavity, but a multiplicity of cavities.
  • This multiplicity of cavities may be arranged on the template in particular in the manner of a pattern. It is thus possible for there to be a first group of cavities which, together, form a first pattern in a raster-like manner (for example a rectangle which is formed from a multiplicity of dot cavities arranged in a rectangular shape). This pattern can then be arranged repeatedly on the template using further groups of cavities with a certain distance therebetween (however, it is also possible, as an alternative, for the pattern to be arranged on the template in varying form).
  • the individual patterns of the template are guided one after the other past in the first instance the adhesive- transfer infeed and then the transporting-fluid-supply opening.
  • the individual patterns may be arranged in the manner of a circular ring, and therefore the pattern can be guided endlessly past the adhesive -transfer infeed and the transporting-fluid-supply opening. This makes it possible for application to be optimized in particular in the case of a substrate which is guided endlessly beneath the apparatus.
  • the template is in particular pivoted by the displacement device.
  • "Pivoting” here, for purposes of the present disclosure, in particular also covers rotation of the template and is understood in the form of a broadly encompassing term.
  • the template may be designed, in particular, in the geometrical form of a CD, having approximately the typical dimensions thereof.
  • the cavities are then made through the surface of the CD-like body by etching, cutting operations or the like.
  • the adhesive in addition to providing straightforward basic patterns (such as a rectangular arrangement of numerous cavities), more complex patterns are also made possible. It is thus possible for the adhesive to be applied to a baby's diaper for example in the form of motifs which are suitable for children (for example in the form of a teddy bear or of a teddy-bear head or also of a bird or the like). This may be desired, in the case of a diaper, for example for providing a so-called moisture or wetness indicator, in the case of which a, for example, transparent film, or some other transparent material layer, is also applied, in a later operating step, over the adhesive applied, and the adhesive changes color in dependence on the level of moisture of the substrate.
  • the preferably rotationally displaced template can usually be activated by a drive (for example by a servomotor), which acts on the template typically via a drive shaft.
  • a drive for example by a servomotor
  • the template here is incorporated in the apparatus such that it can be changed over without use being made of tools and/or auxiliary means.
  • an appropriate template to be designed in the manner of a CD and for the apparatus to provide a corresponding ejecting shaft or an ejecting drawer for the CD-like template.
  • a user can store a plurality of templates with different cavity arrangements (pattern arrangements) and straightforwardly change over the templates manually by ejecting the template which has just been used and inserting a new one.
  • the intention is to disclose, in particular, a system comprising an apparatus as claimed in claim 1 (or one of the following claims) and a second, alternative template, which can be changed over in a user- friendly manner in replacement of the first template, in particular with the aid of a tool-free opening mechanism of the apparatus.
  • the opening mechanism here is provided such that the apparatus does not have to be specially dismantled. Rather, it is possible for the templates to be changed over without use being made of tools and/or auxiliary means.
  • the apparatus can be used to apply a so-called hot-melt adhesive to a substrate.
  • the hot-melt adhesive is directed to the adhesive -transfer infeed when it is already in a liquid to pasty state. It is possible here for the adhesive to be kept in a tank or similar store when it is already in a liquid to pasty state or, as an alternative, also in a solid state (that is to say, for example, in the form of flakes).
  • the critical factor is for the hot-melt adhesive to have reached a liquid to pasty state by being heated up prior to, or upon, reaching the adhesive- transfer infeed.
  • all the elements of the apparatus may be heatable in principle, that is to say, in particular, also the template, for example passively by way of the surrounding structural elements of the apparatus.
  • the structural elements may have heating channels or the like or dispense a certain amount of heat to the template on account of their material properties.
  • the adhesive is discharged onto a substrate which, typically, is located directly beneath the apparatus.
  • the apparatus is advanced as closely as possible up to the substrate, but does not make contact therewith.
  • a substrate is understood as being, in particular, an essentially sheet-like body which can be displaced preferably relative to the apparatus (or in particular relative to an exit opening).
  • a substrate may be, in particular, a so-called endless material.
  • the apparatus can advantageously be used particularly in the field of so-called disposable hygiene products. These include, for example, diapers and sanitary napkins.
  • disposable hygiene products include, for example, diapers and sanitary napkins.
  • wing elements or closure elements are adhesively bonded to the basic substrate, for which purpose the basic substrate has to be wetted with adhesive.
  • Another example is the already described wetness indicator.
  • a template in practice, will have one or a multiplicity of cavities, it being possible for a first group of the multiplicity of cavities to form, for example, a first pattern and for a second group of a multiplicity of cavities then to form a second pattern, etc.
  • the apparatus presented makes it possible to dispense with extremely costly volumetric gear pumps which are known, in particular, in the prior art. It is usually sufficient for the adhesive to be supplied to the adhesive-transfer infeed in some other way. For example, normal piston pumps or similar pumping means can be used for this purpose.
  • the apparatus has, in principle, a control means which is in connection with the drive of the template and which is also connected to the drive mechanism of the substrate, and controls the same.
  • a control means which is in connection with the drive of the template and which is also connected to the drive mechanism of the substrate, and controls the same.
  • the drive speed of the template is adapted to the drive speed of the substrate.
  • the speed of the template and substrate can be regulated such that the template executes a full revolution as precisely one substrate product which is to be wetted (for example a diaper or a sanitary napkin) is guided along beneath the template.
  • the apparatus has an exit opening which is assigned to the cavity when the template is located in the second position.
  • the exit opening is assigned to the transporting-fluid-supply opening and is arranged in particular opposite the same (as seen in relation to the template).
  • the transporting fluid can drive the adhesive out of the cavity of the template and through the exit opening.
  • the exit opening is of basically stationary design, i.e. it is at a fixed location and, in particular, at a fixed location relative to the substrate located beneath (at any rate if the latter is not being moved).
  • the exit opening here is provided, in particular, by an outer termination plate or a nozzle plate of the apparatus, the plate usually covering the template. In this case, the exit opening is thus assigned to a separate component.
  • exit opening is also conceivable in principle for the exit opening to be provided by the template or by a cavity outlet assigned to the substrate.
  • the exit opening of the apparatus here is advantageously adapted to the so-called air knife and the design thereof and is further advantageously arranged as closely as possible to the substrate, and even on the template.
  • a further advantageous configuration provides for the apparatus to have an adhesive-outflow channel, of which the inlet is assigned to the cavity when the template is located in the first position.
  • the inlet of the adhesive-outflow channel is assigned to the adhesive-transfer infeed, and is arranged in particular opposite the same (as seen in relation to the template).
  • the adhesive-outflow channel allows circulation or flow through the cavity when the cavity is being filled, and in particular allows the air located in the cavity to be discharged (this avoiding the situation where the adhesive displaced becomes mixed with the air).
  • the adhesive thus flows through the cavity during the filling operation and can be guided away from the template preferably on the other side of the template.
  • the adhesive-outflow channel is particularly advantageous here for the adhesive-outflow channel to be designed in the form of an adhesive -return channel, in which case the unused adhesive can be guided back to the adhesive store, and an adhesive circuit is therefore formed.
  • the adhesive -outflow channel it is also possible for the adhesive -outflow channel to direct the adhesive out into a separate store, although the design in the form of an adhesive -return channel is considered, in principle, to be more advantageous. It is also possible for the adhesive-outflow channel to be heated.
  • the apparatus advantageously has a sealing wall, or a plurality of sealing walls, between the adhesive-transfer infeed (and possibly the inlet of the adhesive -outflow channel) and the transporting-fluid-supply opening (and possibly the exit opening).
  • a sealing wall or a plurality of sealing walls, between the adhesive-transfer infeed (and possibly the inlet of the adhesive -outflow channel) and the transporting-fluid-supply opening (and possibly the exit opening).
  • These walls further advantageously consist of a sealing material which, in addition, has a particularly suitable coefficient of friction, since the walls, ideally, must not obstruct displacement of the template or, at most, must obstruct the same only to a very slight extent.
  • the template is made to rotate by the displacement device.
  • the template may be designed, for example, in the form of a disk, in particular in the manner of a CD, or for example also in the form of a cylinder tube.
  • the template can rotate about a central axis of rotation, and therefore a full revolution or rotation of the template results in the cavity or the cavities being guided precisely once past the adhesive-transfer infeed and/or past the transporting-fluid-supply opening.
  • a rotationally displaced template requires the arrangement of the cavities to be adapted in order to take account of the fact that the cavities are guided in rotation past the transporting-fluid-supply opening, while the substrate is moved linearly past the transporting-fluid-supply opening. This applies, in particular, to the template being designed in the form of a disk; less to the template being designed in the form of a cylinder tube.
  • the template is designed in the form of a disk, the latter having in particular a diameter between 5 and 20 cm, more particularly between 7 and 14 cm, preferably of approximately 12 cm.
  • This diameter here corresponds approximately to the diameter of a commercially available CD, as a result of which the template can be picked up in one hand and inserted into commercially available CD cases for storage purposes.
  • the template in the same way as a commercially available CD, it is also the case that the template, rather than being a closed disk, is advantageously of annular design.
  • the template is further advantageously designed in the form of a round disk.
  • Cavities are introduced between the upper side of the template and the underside of the template, in order to allow specific application patterns of the adhesive on the substrate.
  • the disk is preferably a stainless-steel disk, which is further advantageously subjected to laser cutting in order for the cavities to be introduced.
  • the disk it is also possible for the disk to be machined by means other than a laser cutter in order to form the template. For example, use can be made of etching techniques or water-jet cutters or the like.
  • a further advantage of the design of a disk with one of the aforementioned diameters is that, in the case of the cavities being arranged in the outer region of the disk, the cavities, during precisely one revolution of the disk, cover a distance which corresponds approximately to the application region of a diaper. If the intention is to wet a shorter product, for example a sanitary napkin, it is also possible for the openings or the patterns to be arranged more closely to the axis of rotation of the disk. As an alternative, for the purpose of wetting a shorter product, it is also possible to use a template which has a pattern progressing only over part of its circumference (for example only half or three quarters of the template has a pattern progressing over it).
  • the speed of the template is changed relative to the conveying speed of the substrate, in particular to be increased (account having to be taken, for the arrangement of the cavities in the template, of a corresponding application distortion).
  • the template further advantageously has a positioning marker.
  • this positioning marker is intended to facilitate coordination with the substrate which is to be wetted. It is thus possible for the template to have patterns which necessarily provide a certain starting point (which are to be applied to a substrate first). The user can identify, from the positioning marker, the alignment in which the template is to be inserted into the apparatus or arranged on the apparatus.
  • the positioning marker may be, for example, a graphic marker, in the manner of a print, on the template or a physical marker, in the manner of a material cutout (notch) or an addition of material (material lug) or the like.
  • the apparatus in this case is configured particularly advantageously if it has, in addition, a stationary counter-marker, which the user can use as a reference point for inserting or fitting the template.
  • the template it is thus possible for the template to have, for example, a marker in the manner of an arrow and for the apparatus mount (e.g. a frame) for the template to have a second arrow, wherein the two arrows have to be aligned in relation to one another when the template is inserted. If the arrows are aligned with one another, then the user can assume that, when the apparatus is switched on, in the first instance the expected pattern will be applied to the substrate.
  • annular template As an alternative to a graphic marker, however, it is also possible for an annular template to have, in the region of its central opening, a small lug or a notch which can be brought into form-fitting engagement with a counter- notch or counter-lug of the shaft driving it.
  • the apparatus has an opening mechanism which allows the template used to be replaced by an alternative template without use being made of auxiliary means or tools.
  • the template is designed in the form of a disk
  • the apparatus it is possible for the apparatus to have an accommodating drawer for the template, the drawer being opened by the push of a button, or for the apparatus to have an introduction slot for the template.
  • the template can be installed or inserted even by a layman, there being no need for a person skilled in the art to dismantle the apparatus (in part at any rate).
  • the cavity provided in the template advantageously has a width of not more than two millimeters, preferably of not more than one millimeter. It is possible, in this context, for the cavity to be designed either essentially in the form of dots or else in linear form, the line then being of the maximum width mentioned (but being very much longer than two millimeters or one millimeter in the longitudinal direction).
  • a template usually has very many more than just one cavity. Rather, the template has patterns which are made up in each case of numerous cavities. Such patterns are introduced into the template in particular in a rasterized state, rather than over a continuous surface area.
  • a method of applying a liquid to pasty hot-melt adhesive includes:
  • the drive of the template is advantageously activated in dependence on displacement of the substrate. This provides, in particular, advantages for switching on the apparatus. This is because conventional prior-art apparatuses involve a so-called "ramp effect", which ensures that the operation of applying adhesive, when the system is switched on/started up, can be adapted only to a certain extent to the start-up speed of the substrate located beneath.
  • the disadvantage here is that the substrate which is wetted during the start-up process of the system cannot be used industrially in its entirety and has to be disposed of.
  • the template according to the method of the invention, is driven by a servomotor, however, the template and substrate, as presently disclosed, can be synchronized such that no ramp effect occurs. It is thus possible for the activation of substrate displacement to take place in dependence on the activation of the template, and therefore no ramp effect occurs and even that part of the substrate which is wetted first can be used industrially.
  • control means of the template drive may be adapted to the substrate such that the individual cavities, when being displaced, have approximately a circumferential speed which corresponds to the linear speed of the substrate.
  • the speed of the template can be increased.
  • the application pattern is to be equalized, the speed of the template can be reduced. Displacement of the template always takes place in dependence on displacement of the substrate.
  • a joint apparatus control means may be provided for this purpose.
  • FIG. 1 shows, in a schematic, perspective obliquely illustrated plan view from the front, of an embodiment of the apparatus in a state in which it has not yet been connected to electricity and compressed air;
  • Fig. 2 shows, in a perspective/schematic obliquely illustrated bottom view from the rear side, the apparatus of Fig. 1, connected neither to an adhesive outflow nor to an adhesive infeed;
  • FIG. 3 shows, in a further perspective obliquely illustrated bottom view from the front side, the apparatus of Fig. 1 in a partially exploded state and with a first example of a template inserted;
  • Fig. 4a shows a highly schematic, partially transparent section through the apparatus according of Fig. 3, for example along the seal which, in Fig. 3, is arranged above the template, the seal in Fig. 4a having a modified, essentially square shape, and the template according to Fig. 3, in addition, having been replaced by an alternative template with a different pattern;
  • Fig. 4b shows, in a view according to Fig. 4a, the apparatus with a template pivoted slightly in the counterclockwise direction;
  • Fig. 5 shows, in a highly schematic, cut-away basic illustration, a lateral sectional view through the apparatus in the region of the template;
  • FIG. 6 shows a perspective, highly schematic basic obliquely illustrated plan view of a further alternative template, with adhesive applied to a substrate;
  • Fig. 7a shows, in a view similar to Fig. 6, the template of
  • Fig. 7b shows a highly schematic, cut-away, enlarged plan view of a pattern from the template illustrated in Fig. 7a, the pattern being found approximately in the region Vllb of Fig. 7a;
  • FIG. 8 shows a second embodiment in a highly schematic perspective obliquely illustrated bottom view.
  • a first exemplary embodiment of the apparatus is provided with the reference sign 10 in Figs. 1 to 3.
  • Fig. 1 shows, in a perspective schematic obliquely illustrated plan view, in the first instance the basic construction of the apparatus 10.
  • the apparatus has an application head 11, by means of which the apparatus 10 dispenses adhesive in pattern form onto a substrate, which is arranged beneath the apparatus 10, as seen in relation to Fig. 1, but is not illustrated in Fig. 1.
  • the substrate would be arranged in the vertical direction z beneath the apparatus 10 illustrated in Fig. 1 and could be displaced, for example, linearly in a direction of guidance X.
  • a template which will be described in more detail at a later stage in the text, can be introduced into the application head 11 according to Fig. 1 , the template being concealed in Fig. 1 since it is arranged in the interior of the application head 11.
  • This template is driven in rotation, in the plane defined by the conveying direction X and the transverse direction Y, by a servomotor 13.
  • the servomotor 13 here acts on the template via a transmission 14 with a shaft 15, which may have, for example, a hexagonal cross section.
  • the apparatus of Fig. 1 in addition, has a transporting-fluid or compressed-air connection 16, through which a transporting fluid, for example compressed air, can be introduced into the application head 11 in order to discharge the adhesive from the template and the apparatus 10 and to transfer the adhesive onto the substrate.
  • a transporting fluid for example compressed air
  • the transporting fluid may be, in particular, heated for this purpose, and an electrical connection 17 is therefore provided, it being possible for the electrical connection to be supplied with power in heating zones arranged in the apparatus 10, but not illustrated explicitly. These heating zones can be used both for heating the compressed air introduced through the connection 16 and for keeping the adhesive introduced into the apparatus 10 warm, and therefore liquid to pasty.
  • connection 18 can have connected to it, for example, a separate hose, which connects the apparatus 10 to a hot-melt store.
  • connection 18 can also be used to mount the apparatus 10 rigidly (that is to say not via a hose) on an adhesive infeed.
  • the rear side of the apparatus 10, the rear side being illustrated in Fig. 2 has fasteners 19 in the manner of retaining clamps.
  • the adhesive which enters into the apparatus 10 via the connection 18, is directed first of all (in a manner which is not illustrated in Figs. 1 and 2) into the application head 11, where it can be directed into the template.
  • the adhesive here flows through the template and, in particular, cavities which have been introduced into the template. Displacement of the template thus gives rise, on the one hand, to fractions of adhesive which are displaced along with the template and, on the other hand, when the template is flushed out, in fractions of adhesive which are removed in a manner which will be explained at a later stage in the text.
  • the adhesive once it has flowed through the template (without being transported along by the template), enters, in particular, into an adhesive- outflow channel in the application head 11 and is then directed to an outflow connection or return connection 20.
  • the adhesive either is directed out of the system or, as an alternative, preferably, is introduced back into the adhesive circuit.
  • the return connection 20 for this purpose, likewise to be connected to the same store to which the connection 18 is connected.
  • the adhesive transported along by the template is then discharged from the apparatus 10, out of an exit opening 21 of the application head 11, the opening being illustrated in Fig. 2, at a different location, with the aid of the transporting fluid directed into the apparatus 10 via the connection 16 according to Fig. 1, and applied to the substrate located beneath.
  • Fig. 3 shows the application head 11 in an exploded state.
  • the application head 11 comprises, from top to bottom, a base 22, a first seal 23, a frame 24 for the template, a second, lower seal 25 and a nozzle plate 26.
  • all the structural elements of the application head 11 here have a multiplicity of assembly openings which are aligned in relation to one another and of which just in each case one assembly opening of each structural element is designated by 27 in Fig. 3.
  • pin-like retaining means 28 such as bolts or screws, can be plugged in a conventional manner through the openings 27.
  • a template 29 is introduced into the frame 24, that is to say beneath the first seal 23 and above the second seal 25.
  • the template is of round design, in the form of a disk, and has approximately the diameter of a commercially available CD. It has a central engagement opening 30, which may be of, for example, hexagonal design and through which, during assembly, a head 31 of the shaft 15 is plugged in a form- fitting manner.
  • the template 29 consists, for example, of stainless steel and is provided with cavities which are arranged to form patterns (a plurality of identical patterns in the form of teddy-bear heads are evident in Fig. 3) and are introduced into the disk 29 in the manner of laser cutting.
  • the apparatus shown in Figs. 1 to 3 is provided with a single template for the duration of use. It is therefore the case that Figs. 1 to 3 do not show any means for changing over the template 29 without use being made of tools.
  • the apparatus 10 may be adapted such that the template 29 can be changed over in the manner of a CD player or CD changer, without use being made of tools.
  • the application head 11 may provide, for example, an ejecting drawer or some other kind of (for example a slot- like) ejecting mechanism, as is also known from commercially available CD players.
  • a hot-melt adhesive to be directed into the apparatus 10 via the adhesive connection 18 illustrated in Fig. 2.
  • the adhesive is then transferred, or directed onward, within the base 22 of the application head 11, from a dispensing opening 32, which is illustrated in Fig. 3, to a transfer opening 33 in the first seal 23.
  • pumps such as piston pumps or the like, in particular upstream of the apparatus 10.
  • the adhesive can enter, from the transfer opening 33, into those cavities of the template 29 which are moving past the transfer opening 33.
  • the cavities of the template 29 have in particular the adhesive which is exiting from the transfer opening 33 flowing through them and, once it has passed through the template 29 (at any rate at least in part), the adhesive passes into an outflow opening 34 in the second seal 25. From this outflow opening 34 in the second seal 25, the outflowing adhesive can then pass into an outflow channel within the nozzle plate 26 and, from there, be directed to the return connection or outflow connection 20 illustrated in Fig. 2.
  • a transporting fluid in particular compressed air
  • a fluid-transfer opening 36 which is provided in the base 22 and is illustrated in Fig. 3.
  • the fluid exits from the fluid opening 35 with a very sharp edge, the fluid opening 35 and the fluid-transfer opening 36 constituting part of a so-called air knife, which provides high-pressure air which exits discretely with very sharp edges.
  • the geometry of the fluid opening 35 is therefore also very much narrower than the geometry of the fluid-transfer opening 36.
  • the very sharp-edged compressed air exiting from the fluid opening 35 of the first seal 23 then drives the adhesive out of the adhesive-filled cavities in the template 29 which are being guided past beneath the air.
  • the compressed air, together with the adhesive is removed from, or blown out of, the apparatus 10 from the template 29, via a dispensing opening 37 in the second seal 25 and the exit opening 21 in the nozzle plate 26, and transferred onto the substrate located beneath.
  • first and second seals 23 and 25 particularly advantageously have coefficients of friction, in order to allow the disk 29 to be displaced within the application head 11 in as friction-free a manner as possible.
  • the seals 23 and 25 are capable of butting closely enough against the template 29 to be able to perform their sealing function to a sufficient extent.
  • Fig. 4a shows a section, in plan view, through the apparatus
  • the template 29 illustrated in Fig. 4a is an alternative template to the template which is illustrated in Fig. 3, since the template 29 according to Fig. 4 has a different pattern. It is also the case that, for reasons of simplicity, the geometry of the first seal 23 has been simplified in the illustration to a square shape (whereas Fig. 3 illustrates a half-rounded seal 23), but, rather than adversely affecting the basic character of the seal, this is merely intended to simplify the illustration.
  • FIG. 4a shows a template with cavities 38 which are arranged in a raster-like manner, for the sake of simplicity only some of these cavities being designated thus in Fig. 4a.
  • the template 29 is located in a position in which eight cavities 38, which are arranged in a row 39, are arranged beneath the transfer opening 33 in the seal 23, as yet no cavity 38 being arranged beneath the fluid opening 35.
  • the first row 39 of cavities is thus, according to Fig. 4a, just in the process of being filled with adhesive.
  • the template 29 here, in respect of Figs. 4a and 4b, is displaced in the pivoting direction S, that is to say is pivoted in a counterclockwise direction, by the shaft head 31 engaging in the engagement opening 30 of the template 29. During this displacement, the template 29 reaches the position which is illustrated in Fig.
  • the air knife can then blow out the contents of the first row 39 of cavities 38, via the fluid opening 35, in a downward direction as seen in relation to the plane of the figure, that is to say onto a substrate arranged beneath the plane of the figure, through the exit opening 21 (as is illustrated in Fig. 3).
  • the first row 39 is thus having its contents blown out, whereas the fifth row 40 of cavities 38 is in the process of being charged with adhesive, namely via the transfer opening 33.
  • a feature which is illustrated in Figs. 4a and 4b is a positioning marker 41 of the template 29, which is designed in the form of a physical notch.
  • the shaft or the shaft head 31 has arranged on it a positioning lug 42, which engages in the positioning notch 41.
  • These positioning aids 41 and 42 are essentially not involved in driving the template 29; rather, they are used for correct initial positioning of the template 29 within the application head 11 (or within the frame 24). By virtue of these positioning aids 41 and 42 coinciding, the template can be positioned manually just in precisely one (aligned) position within the application head 11.
  • Fig. 5 is intended to clarify the filling operation of a template 29 and illustrates a highly schematic, lateral sectional view through a template 29 and through the first seal 23, the second seal 25 and the nozzle plate 26 (the material thicknesses of the components being illustrated in distorted form in Fig. 5 for reasons of clarity).
  • Fig. 5 illustrates a snapshot in which a first cavity 38a has not yet been filled with adhesive.
  • a second cavity 38b according to Fig. 5, is in the process of having adhesive flowing through it, the adhesive being directed into the cavity 38b via the transfer opening 33 in the first seal 23.
  • the adhesive flowing through can enter into the second seal 25, to be precise into the outflow opening 34.
  • the adhesive then passes into an outflow channel 43 in the nozzle plate 26, via which it passes (via further channel portions which are not illustrated) to the outflow connection or return connection 20 according to Fig. 2.
  • Fig. 5 also shows a third cavity 38c, which has already been filled, but is not yet emptied. Finally, Fig. 5 illustrates a fourth cavity 38d, which has just been emptied by the air knife, using compressed air supplied via the fluid opening 35. Accordingly, the adhesive located in the cavity 38d has just been removed from the apparatus 10 via the dispensing opening 37 and via the exit opening 21.
  • exit opening 21, and in particular also the dispensing opening 37 are designed to be wider than the cavity 38d. This allows optimized discharge of the adhesive from the cavity 38d.
  • the chambers in the present exemplary embodiment all have the same width b, which in the present exemplary embodiment is somewhat less than one millimeter, and it should be pointed out that the cross-sectional illustration of the disk 29 is distorted, since the individual cavities 38, on account of the rotary arrangement on the round disk, would not actually be located in a section plane. In sectional illustration, the cavities 38 have thus been projected into a common section plane, in order for the filling and emptying operations of the cavities to be explained purely schematically.
  • the walls sealing the disk 29 and/or the cavities, in particular cavity 38c, arranged in this region are also possible to dispense with the walls 50a and 50b, in particular the lower wall 50b, if it is ensured that the adhesive remains in the cavity 38 on account of surface tensions or the like.
  • the exit opening of the apparatus could then be provided by the underside of the cavity 38 itself.
  • Fig. 6 shows, in a highly schematic illustration, a further exemplary embodiment of a template 29, with a bar-like application pattern 45 on the substrate 44.
  • the application pattern 45 in terms of its geometrical shape, in the first instance clearly differs from the pattern 46 as is actually provided in the template 29.
  • the application pattern 45 has its outer contour formed in the shape of a rectangle (and thus has right angles), this is not the case for the contour of the pattern 46 which is actually introduced into the template 29. Rather, the pattern 46 has curved outer contour lines 47a and 47b.
  • the patterns 45 and 46 differ from one another as a result of the rotary displacement of the template 29 along the displacement direction S, which naturally differs from the linear displacement direction or conveying direction X of the substrate 44. Since the aim is for a desired application pattern 45 to be applied to the substrate, it has been found in practice to be advantageous to provide software which a user can use to predetermine their desired application pattern 45. The software, then, automatically calculates the shape of the actual pattern 46 on the template and can initiate appropriate cutting of cavities on a template blank.
  • large-surface-area application patterns such as the application pattern 45 according to the present invention, are, in principle, rasterized.
  • the template rather than a single large cavity being provided within the template 29, the template actually contains a multiplicity of small cavities 38 arranged, and distributed uniformly, within a desired contour.
  • Fig. 7a shows, in a view according to Fig. 6, the template 29 as can already be seen in Fig. 3.
  • the template has a plurality of patterns 46a to 46j, all of identical configuration. In an alternative embodiment, these patterns 46a to 46j could also be varied. It is clear from Fig. 7a here that the individual template patterns 46a to 46j are arranged in annular form in relation to one another, whereas the patterns, when actually applied to the substrate, are arranged in linear form, that is to say in a row.
  • Fig. 7b shows an enlarged illustration of the template pattern
  • the pattern 46d in Fig. 7a. It is clear from Fig. 7b here that the pattern 46d, rather than being of continuous design, actually comprises numerous small cavities or sub-cavities 38a to 38s. To this extent, rasterization is also provided for such patterns, each of the cavities 38a to 38s having a width of less than one millimeter. To this extent, all the cavities 38a to 38s are of identical width, but vary in length.
  • Fig. 8 shows a second exemplary embodiment of an apparatus 10' according to the invention.
  • the template 29' here is designed, in a rotationally symmetrical manner about a pivot axis a, in the form of a cylinder surface or cylinder tube 29', which rotates about the longitudinal axis a along the direction of rotation r.
  • the individual exit openings of the individual patterns 46' in the template 29' are likewise guided past an exit opening 2 , which is arranged in a central body 47.
  • the central body 47 On its side assigned to the inside of the template 29', as is indicated merely schematically in Fig. 8, the central body 47 has connections 16', 17', 18' and 20' for compressed air, power and adhesive and also has an adhesive outflow.
  • the construction of the central body 47 here may be essentially identical to the construction of the application head 11 belonging to the apparatus 10 according to Figs. 1 to 7.
  • the central body 47 has a cross section which corresponds essentially to Fig. 5. Accordingly, alongside the exit opening 21 ' illustrated in Fig. 8, the central body 47 of course also contains within it an outflow opening for the adhesive and a fluid opening for providing an air knife, by means of which the adhesive (which is transported from the transfer opening to the fluid opening along the direction of rotation r) is then transferred, via the exit opening 2 , onto the substrate, which is arranged beneath the central body 47, but is not illustrated in Fig. 8.
  • Fig. 8 essentially makes clear the fact that the template need not be designed in the form of a disk. Rather, it may also be designed in tubular form. However, a rotary body is always advantageous, be this in the form of a disk 29 or in the form of a cylinder tube 29', since this allows a rotary operation which can guide the cavities endlessly past the exit opening.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

La présente invention concerne l'application d'un adhésif fusible liquide à pâteux sur un substrat (44), comprenant une forme (29) présentant au moins une cavité (38) pour l'adhésif fusible et comprenant également une entrée d'alimentation permettant le transfert d'adhésif (33) qui est attribuée à la forme (29) et à travers laquelle l'adhésif peut être introduit dans la cavité (38). La caractéristique particulière consiste en ce que l'appareil (10) comprend en outre une ouverture d'alimentation de fluide de transport (35), attribuée à la forme (29) et un dispositif destiné au déplacement (13, 15), en particulier par pivotement de la forme (29) entre une première position dans laquelle la cavité (38) est attribuée à l'entrée d'alimentation de transfert d'adhésif (33) et une seconde position, dans laquelle la cavité (38) est attribuée à l'ouverture d'alimentation en fluide de transport (35) et, par conséquent, l'adhésif, dans la seconde position, peut être évacué de la cavité (38) par un fluide de transport s'écoulant à travers l'ouverture d'alimentation en fluide de transport (35).
PCT/US2015/031988 2014-05-22 2015-05-21 Appareil destiné à l'application d'un adhésif fusible à un substrat WO2015179650A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102014007425.0 2014-05-22
DE102014007425.0A DE102014007425B4 (de) 2014-05-22 2014-05-22 Vorrichtung und Verfahren zum Aufbringen eines Heissschmelzklebstoffes auf ein Substrat
US14/689,236 2015-04-17
US14/689,236 US9797035B2 (en) 2014-05-22 2015-04-17 Apparatus for applying a hot-melt adhesive to a substrate

Publications (1)

Publication Number Publication Date
WO2015179650A1 true WO2015179650A1 (fr) 2015-11-26

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4911948A (en) 1988-09-07 1990-03-27 Acumeter Laboratories, Inc. Method of screen printing and application of hot melt upon moving web substrates
US5360516A (en) * 1992-11-12 1994-11-01 Philip Morris Incorporated Application of fluidized material to a substrate using intermittent charges of compressed air
EP0675183A1 (fr) 1994-03-30 1995-10-04 KUFNER TEXTILWERKE GmbH Procédé pour le revêtement sous forme de trames de surfaces flexibles avec colles fusibles
DE19854634C1 (de) * 1998-11-26 2000-02-24 Wolfgang Puffe Auftragskopf mit Rotationssieb
EP1429029A2 (fr) 2002-12-12 2004-06-16 Illinois Tool Works, Inc. Assemblage de distributeur de colle thermofusible comprenant des ensembles indépendants de pompe à engrenage
US20060027683A1 (en) * 2004-08-04 2006-02-09 Marcel Puffe Application head

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4911948A (en) 1988-09-07 1990-03-27 Acumeter Laboratories, Inc. Method of screen printing and application of hot melt upon moving web substrates
US5360516A (en) * 1992-11-12 1994-11-01 Philip Morris Incorporated Application of fluidized material to a substrate using intermittent charges of compressed air
EP0675183A1 (fr) 1994-03-30 1995-10-04 KUFNER TEXTILWERKE GmbH Procédé pour le revêtement sous forme de trames de surfaces flexibles avec colles fusibles
DE19854634C1 (de) * 1998-11-26 2000-02-24 Wolfgang Puffe Auftragskopf mit Rotationssieb
EP1429029A2 (fr) 2002-12-12 2004-06-16 Illinois Tool Works, Inc. Assemblage de distributeur de colle thermofusible comprenant des ensembles indépendants de pompe à engrenage
US20060027683A1 (en) * 2004-08-04 2006-02-09 Marcel Puffe Application head

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